export class FileService {
  static $inject = ['$q'];

  constructor(private $q: ng.IQService) {
  }
 
  getContentFromBlobAsBinaryString(blob: Blob): ng.IPromise<any> {
    let deferred = this.$q.defer();

    if (!FileReader.prototype.readAsBinaryString) {
      FileReader.prototype.readAsBinaryString = function (fileData) {
        var binary = "";
        var pt = this;
        var reader = new FileReader();
        reader.onload = function (e) {
          var bytes = new Uint8Array(reader.result);
          var length = bytes.byteLength;
          for (var i = 0; i < length; i++) {
            binary += String.fromCharCode(bytes[i]);
          }
          pt.content = binary;
          $(pt).trigger('onload');
        };

        reader.readAsArrayBuffer(fileData);
      };
    }

    let fileReader = new FileReader();

    fileReader.onload = function (e: any) {
      let data = (!e) ? (<any>this).content : e.target.result;
      deferred.resolve(data);
    };

    fileReader.onerror = function (error) {
      deferred.reject(error);
    };

    fileReader.readAsBinaryString(blob);

    return deferred.promise;
  }
}